Detectives found a confusing story when they arrived at the Columbo Street home in the Garfield Commons on Saturday night.

“The male shooter was still on scene and said he shot his friend,” said Sgt. Tom Huerbin.

The shooting happened just after 5 p.m. Officials say a man who doesn’t live in the house was there to watch his children while their mother was at work, but he got worried when someone came to the front door and started knocking.

“Somebody was banging at the door, then he went and retrieved his firearm,” Huerbin said. “He came down, found somebody in the house and shot him.”

It wasn’t until after the victim was hit by the bullets that the shooter realized the person who’d come inside was actually a friend -- Andre Broadie, 25, of Penn Hills.

Police say it appears that the visitor came into the home through an unlocked back door, but the shooter thought he had broken into the house.

Broadie's mother, Lakeya Thornhill, told WTAE reporter Bob Mayo that her son and the shooter were best friends who had known each other since childhood. She doesn't understand how this could've happened or how the man couldn't have known Broadie's voice.

"I found out it was his best friend that killed him. It was his best friend that killed him, and they grew up and they went to school together," said Thornhill.

Broadie is survived by a 1-year-old daughter.

"He has a baby that's never going to see him. He's not going to watch her grow," said Thornhill.

The shooter was taken to police headquarters, where he was interviewed and released. The district attorney will review the case to see if the shooter should face any charges.

"I want to know from the DA's office and everybody, how you can tell me it's a mistake and nobody's supposed to suffer except for me and his sisters? Me and his sisters are supposed to live like this and raise his daughter?" said Thornhill.